influxql

package
v0.9.6 Latest Latest
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 Go to latest Published: Dec 8, 2015 License: MIT Imports: 14 Imported by: 0

Documentation

Overview

Package influxql implements a parser for the InfluxDB query language.

InfluxQL is a DML and DDL language for the InfluxDB time series database. It provides the ability to query for aggregate statistics as well as create and configure the InfluxDB server.

Selecting data

The SELECT query is used for retrieving data from one or more series. It allows for a list of columns followed by a list of series to select from. 

SELECT value FROM cpu_load

You can also add a a conditional expression to limit the results of the query: 

SELECT value FROM cpu_load WHERE host = 'influxdb.com'

Two or more series can be combined into a single query and executed together: 

SELECT cpu0.value + cpu1.value
FROM cpu_load AS cpu0 INNER JOIN cpu_load cpu1 ON cpu0.host = cpu1.host

Limits and ordering can be set on selection queries as well: 

SELECT value FROM cpu_load LIMIT 100 ORDER DESC;

Removing data

The DELETE query is available to remove time series data points from the database. This query will delete "cpu_load" values older than an hour: 

DELETE FROM cpu_load WHERE time < now() - 1h

Continuous Queries

Queries can be run indefinitely on the server in order to generate new series. This is done by running a "SELECT INTO" query. For example, this query computes the hourly mean for cpu_load and stores it into a "cpu_load" series in the "daily" shard space. 

SELECT mean(value) AS value FROM cpu_load GROUP BY 1h
INTO daily.cpu_load

If there is existing data on the source series then this query will be run for all historic data. To only execute the query on new incoming data you can append "NO BACKFILL" to the end of the query: 

SELECT mean(value) AS value FROM cpu_load GROUP BY 1h
INTO daily.cpu_load NO BACKFILL

Continuous queries will return an id that can be used to remove them in the future. To remove a continous query, use the DROP CONTINUOUS QUERY statement: 

DROP CONTINUOUS QUERY 12

You can also list all continuous queries by running: 

LIST CONTINUOUS QUERIES

Index

Constants

View Source 
const (
	// Unknown primitive data type.
	Unknown DataType = 0
	// Float means the data type is a float
	Float = 1
	// Integer means the data type is a integer
	Integer = 2
	// Boolean means the data type is a boolean.
	Boolean = 3
	// String means the data type is a string of text.
	String = 4
	// Time means the data type is a time.
	Time = 5
	// Duration means the data type is a duration of time.
	Duration = 6
)
View Source 
const (
	// DateFormat represents the format for date literals.
	DateFormat = "2006-01-02"

	// DateTimeFormat represents the format for date time literals.
	DateTimeFormat = "2006-01-02 15:04:05.999999"
)

Variables

View Source 
var ErrInvalidDuration = errors.New("invalid duration")

ErrInvalidDuration is returned when parsing a malformatted duration.

Functions

func Eval 

func Eval(expr Expr, m map[string]interface{}) interface{}

Eval evaluates expr against a map.

func EvalBool added in v0.9.5 

func EvalBool(expr Expr, m map[string]interface{}) bool

EvalBool evaluates expr and returns true if result is a boolean true. Otherwise returns false.

func FormatDuration 

func FormatDuration(d time.Duration) string

FormatDuration formats a duration to a string.

func HasTimeExpr added in v0.9.5 

func HasTimeExpr(expr Expr) bool

HasTimeExpr returns true if the expression has a time term.

func IdentNeedsQuotes 

func IdentNeedsQuotes(ident string) bool

IdentNeedsQuotes returns true if the ident string given would require quotes.

func IsRegexOp 

func IsRegexOp(t Token) bool

IsRegexOp returns true if the operator accepts a regex operand.

func MatchSource 

func MatchSource(sources Sources, name string) string

MatchSource returns the source name that matches a field name. Returns a blank string if no sources match.

func OnlyTimeExpr added in v0.9.5 

func OnlyTimeExpr(expr Expr) bool

OnlyTimeExpr returns true if the expression only has time constraints.

func ParseDuration 

func ParseDuration(s string) (time.Duration, error)

ParseDuration parses a time duration from a string.

func QuoteIdent 

func QuoteIdent(segments ...string) string

QuoteIdent returns a quoted identifier from multiple bare identifiers.

func QuoteString 

func QuoteString(s string) string

QuoteString returns a quoted string.

func ScanBareIdent 

func ScanBareIdent(r io.RuneScanner) string

ScanBareIdent reads bare identifier from a rune reader.

func ScanDelimited 

func ScanDelimited(r io.RuneScanner, start, end rune, escapes map[rune]rune, escapesPassThru bool) ([]byte, error)

func ScanString 

func ScanString(r io.RuneScanner) (string, error)

ScanString reads a quoted string from a rune reader.

func TimeRange 

func TimeRange(expr Expr) (min, max time.Time)

TimeRange returns the minimum and maximum times specified by an expression. Returns zero times if there is no bound.

func TimeRangeAsEpochNano added in v0.9.2 

func TimeRangeAsEpochNano(expr Expr) (min, max int64)

TimeRange returns the minimum and maximum times, as epoch nano, specified by and expression. If there is no lower bound, the start of the epoch is returned for minimum. If there is no higher bound, now is returned for maximum.

func Walk 

func Walk(v Visitor, node Node)

Walk traverses a node hierarchy in depth-first order.

func WalkFunc 

func WalkFunc(node Node, fn func(Node))

WalkFunc traverses a node hierarchy in depth-first order.

Types

type AlterRetentionPolicyStatement 

type AlterRetentionPolicyStatement struct {
	// Name of policy to alter.
	Name string

	// Name of the database this policy belongs to.
	Database string

	// Duration data written to this policy will be retained.
	Duration *time.Duration

	// Replication factor for data written to this policy.
	Replication *int

	// Should this policy be set as defalut for the database?
	Default bool
}

AlterRetentionPolicyStatement represents a command to alter an existing retention policy.

func (*AlterRetentionPolicyStatement) RequiredPrivileges 

func (s *AlterRetentionPolicyStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute an AlterRetentionPolicyStatement.

func (*AlterRetentionPolicyStatement) String 

func (s *AlterRetentionPolicyStatement) String() string

String returns a string representation of the alter retention policy statement.

type BinaryExpr 

type BinaryExpr struct {
	Op  Token
	LHS Expr
	RHS Expr
}

BinaryExpr represents an operation between two expressions.

func (*BinaryExpr) String 

func (e *BinaryExpr) String() string

String returns a string representation of the binary expression.

type BooleanLiteral 

type BooleanLiteral struct {
	Val bool
}

BooleanLiteral represents a boolean literal.

func (*BooleanLiteral) String 

func (l *BooleanLiteral) String() string

String returns a string representation of the literal.

type Call 

type Call struct {
	Name string
	Args []Expr
}

Call represents a function call.

func (*Call) Fields added in v0.9.4 

func (c *Call) Fields() []string

Fields will extract any field names from the call. Only specific calls support this.

func (*Call) String 

func (c *Call) String() string

String returns a string representation of the call.

type CreateContinuousQueryStatement 

type CreateContinuousQueryStatement struct {
	// Name of the continuous query to be created.
	Name string

	// Name of the database to create the continuous query on.
	Database string

	// Source of data (SELECT statement).
	Source *SelectStatement
}

CreateContinuousQueryStatement represents a command for creating a continuous query.

func (*CreateContinuousQueryStatement) DefaultDatabase 

func (s *CreateContinuousQueryStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*CreateContinuousQueryStatement) RequiredPrivileges 

func (s *CreateContinuousQueryStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a CreateContinuousQueryStatement.

func (*CreateContinuousQueryStatement) String 

func (s *CreateContinuousQueryStatement) String() string

String returns a string representation of the statement.

type CreateDatabaseStatement 

type CreateDatabaseStatement struct {
	// Name of the database to be created.
	Name string

	// IfNotExists indicates whether to return without error if the database
	// already exists.
	IfNotExists bool

	// RetentionPolicyCreate indicates whether the user explicitly wants to create a retention policy
	RetentionPolicyCreate bool

	// RetentionPolicyDuration indicates retention duration for the new database
	RetentionPolicyDuration time.Duration

	// RetentionPolicyReplication indicates retention replication for the new database
	RetentionPolicyReplication int

	// RetentionPolicyName indicates retention name for the new database
	RetentionPolicyName string
}

CreateDatabaseStatement represents a command for creating a new database.

func (*CreateDatabaseStatement) RequiredPrivileges 

func (s *CreateDatabaseStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a CreateDatabaseStatement.

func (*CreateDatabaseStatement) String 

func (s *CreateDatabaseStatement) String() string

String returns a string representation of the create database statement.

type CreateRetentionPolicyStatement 

type CreateRetentionPolicyStatement struct {
	// Name of policy to create.
	Name string

	// Name of database this policy belongs to.
	Database string

	// Duration data written to this policy will be retained.
	Duration time.Duration

	// Replication factor for data written to this policy.
	Replication int

	// Should this policy be set as default for the database?
	Default bool
}

CreateRetentionPolicyStatement represents a command to create a retention policy.

func (*CreateRetentionPolicyStatement) RequiredPrivileges 

func (s *CreateRetentionPolicyStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a CreateRetentionPolicyStatement.

func (*CreateRetentionPolicyStatement) String 

func (s *CreateRetentionPolicyStatement) String() string

String returns a string representation of the create retention policy.

type CreateSubscriptionStatement added in v0.9.5 

type CreateSubscriptionStatement struct {
	Name            string
	Database        string
	RetentionPolicy string
	Destinations    []string
	Mode            string
}

CreateSubscriptionStatement represents a command to add a subscription to the incoming data stream

func (*CreateSubscriptionStatement) RequiredPrivileges added in v0.9.5 

func (s *CreateSubscriptionStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a CreateSubscriptionStatement

func (*CreateSubscriptionStatement) String added in v0.9.5 

func (s *CreateSubscriptionStatement) String() string

String returns a string representation of the CreateSubscriptionStatement.

type CreateUserStatement 

type CreateUserStatement struct {
	// Name of the user to be created.
	Name string

	// User's password.
	Password string

	// User's admin privilege.
	Admin bool
}

CreateUserStatement represents a command for creating a new user.

func (*CreateUserStatement) RequiredPrivileges 

func (s *CreateUserStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a CreateUserStatement.

func (*CreateUserStatement) String 

func (s *CreateUserStatement) String() string

String returns a string representation of the create user statement.

type DataType 

type DataType int

DataType represents the primitive data types available in InfluxQL.

func InspectDataType 

func InspectDataType(v interface{}) DataType

InspectDataType returns the data type of a given value.

func (DataType) String added in v0.9.1 

func (d DataType) String() string

type DeleteStatement 

type DeleteStatement struct {
	// Data source that values are removed from.
	Source Source

	// An expression evaluated on data point.
	Condition Expr
}

DeleteStatement represents a command for removing data from the database.

func (*DeleteStatement) RequiredPrivileges 

func (s *DeleteStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DeleteStatement.

func (*DeleteStatement) String 

func (s *DeleteStatement) String() string

String returns a string representation of the delete statement.

type Dimension 

type Dimension struct {
	Expr Expr
}

Dimension represents an expression that a select statement is grouped by.

func (*Dimension) String 

func (d *Dimension) String() string

String returns a string representation of the dimension.

type Dimensions 

type Dimensions []*Dimension

Dimensions represents a list of dimensions.

func (Dimensions) Normalize 

func (a Dimensions) Normalize() (time.Duration, []string)

Normalize returns the interval and tag dimensions separately. Returns 0 if no time interval is specified.

func (Dimensions) String 

func (a Dimensions) String() string

String returns a string representation of the dimensions.

type Distinct 

type Distinct struct {
	// Identifier following DISTINCT
	Val string
}

Distinct represents a DISTINCT expression.

func (*Distinct) NewCall 

func (d *Distinct) NewCall() *Call

NewCall returns a new call expression from this expressions.

func (*Distinct) String 

func (d *Distinct) String() string

String returns a string representation of the expression.

type DropContinuousQueryStatement 

type DropContinuousQueryStatement struct {
	Name     string
	Database string
}

DropContinuousQueryStatement represents a command for removing a continuous query.

func (*DropContinuousQueryStatement) RequiredPrivileges 

func (s *DropContinuousQueryStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a DropContinuousQueryStatement

func (*DropContinuousQueryStatement) String 

func (s *DropContinuousQueryStatement) String() string

String returns a string representation of the statement.

type DropDatabaseStatement 

type DropDatabaseStatement struct {
	// Name of the database to be dropped.
	Name string

	// IfExists indicates whether to return without error if the database
	// does not exists.
	IfExists bool
}

DropDatabaseStatement represents a command to drop a database.

func (*DropDatabaseStatement) RequiredPrivileges 

func (s *DropDatabaseStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropDatabaseStatement.

func (*DropDatabaseStatement) String 

func (s *DropDatabaseStatement) String() string

String returns a string representation of the drop database statement.

type DropMeasurementStatement 

type DropMeasurementStatement struct {
	// Name of the measurement to be dropped.
	Name string
}

DropMeasurementStatement represents a command to drop a measurement.

func (*DropMeasurementStatement) RequiredPrivileges 

func (s *DropMeasurementStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a DropMeasurementStatement

func (*DropMeasurementStatement) String 

func (s *DropMeasurementStatement) String() string

String returns a string representation of the drop measurement statement.

type DropRetentionPolicyStatement 

type DropRetentionPolicyStatement struct {
	// Name of the policy to drop.
	Name string

	// Name of the database to drop the policy from.
	Database string
}

DropRetentionPolicyStatement represents a command to drop a retention policy from a database.

func (*DropRetentionPolicyStatement) RequiredPrivileges 

func (s *DropRetentionPolicyStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropRetentionPolicyStatement.

func (*DropRetentionPolicyStatement) String 

func (s *DropRetentionPolicyStatement) String() string

String returns a string representation of the drop retention policy statement.

type DropSeriesStatement 

type DropSeriesStatement struct {
	// Data source that fields are extracted from (optional)
	Sources Sources

	// An expression evaluated on data point (optional)
	Condition Expr
}

DropSeriesStatement represents a command for removing a series from the database.

func (DropSeriesStatement) RequiredPrivileges 

func (s DropSeriesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropSeriesStatement.

func (*DropSeriesStatement) String 

func (s *DropSeriesStatement) String() string

String returns a string representation of the drop series statement.

type DropServerStatement added in v0.9.5 

type DropServerStatement struct {
	// ID of the node to be dropped.
	NodeID uint64
	// Force will force the server to drop even it it means losing data
	Force bool
}

DropServerStatement represents a command for removing a server from the cluster.

func (*DropServerStatement) RequiredPrivileges added in v0.9.5 

func (s *DropServerStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropServerStatement.

func (*DropServerStatement) String added in v0.9.5 

func (s *DropServerStatement) String() string

String returns a string representation of the drop series statement.

type DropSubscriptionStatement added in v0.9.5 

type DropSubscriptionStatement struct {
	Name            string
	Database        string
	RetentionPolicy string
}

DropSubscriptionStatement represents a command to drop a subscription to the incoming data stream.

func (*DropSubscriptionStatement) RequiredPrivileges added in v0.9.5 

func (s *DropSubscriptionStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a DropSubscriptionStatement

func (*DropSubscriptionStatement) String added in v0.9.5 

func (s *DropSubscriptionStatement) String() string

String returns a string representation of the DropSubscriptionStatement.

type DropUserStatement 

type DropUserStatement struct {
	// Name of the user to drop.
	Name string
}

DropUserStatement represents a command for dropping a user.

func (*DropUserStatement) RequiredPrivileges 

func (s *DropUserStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a DropUserStatement.

func (*DropUserStatement) String 

func (s *DropUserStatement) String() string

String returns a string representation of the drop user statement.

type DurationLiteral 

type DurationLiteral struct {
	Val time.Duration
}

DurationLiteral represents a duration literal.

func (*DurationLiteral) String 

func (l *DurationLiteral) String() string

String returns a string representation of the literal.

type ExecutionPrivilege 

type ExecutionPrivilege struct {
	// Admin privilege required.
	Admin bool

	// Name of the database.
	Name string

	// Database privilege required.
	Privilege Privilege
}

ExecutionPrivilege is a privilege required for a user to execute a statement on a database or resource.

type ExecutionPrivileges 

type ExecutionPrivileges []ExecutionPrivilege

ExecutionPrivileges is a list of privileges required to execute a statement.

type Expr 

type Expr interface {
	Node
	// contains filtered or unexported methods
}

Expr represents an expression that can be evaluated to a value.

func CloneExpr 

func CloneExpr(expr Expr) Expr

CloneExpr returns a deep copy of the expression.

func ParseExpr 

func ParseExpr(s string) (Expr, error)

ParseExpr parses an expression string and returns its AST representation.

func Reduce 

func Reduce(expr Expr, valuer Valuer) Expr

Reduce evaluates expr using the available values in valuer. References that don't exist in valuer are ignored.

type Field 

type Field struct {
	Expr  Expr
	Alias string
}

Field represents an expression retrieved from a select statement.

func (*Field) Name 

func (f *Field) Name() string

Name returns the name of the field. Returns alias, if set. Otherwise uses the function name or variable name.

func (*Field) String 

func (f *Field) String() string

String returns a string representation of the field.

type Fields 

type Fields []*Field

Fields represents a list of fields.

func (Fields) AliasNames added in v0.9.3 

func (a Fields) AliasNames() []string

AliasNames returns a list of calculated field names in order of alias, function name, then field.

func (Fields) Len 

func (f Fields) Len() int

Sort Interface for Fields

func (Fields) Less 

func (f Fields) Less(i, j int) bool

func (Fields) Names added in v0.9.3 

func (a Fields) Names() []string

Names returns a list of raw field names.

func (Fields) String 

func (a Fields) String() string

String returns a string representation of the fields.

func (Fields) Swap 

func (f Fields) Swap(i, j int)

type FillOption 

type FillOption int
const (
	// NullFill means that empty aggregate windows will just have null values.
	NullFill FillOption = iota
	// NoFill means that empty aggregate windows will be purged from the result.
	NoFill
	// NumberFill means that empty aggregate windows will be filled with the given number
	NumberFill
	// PreviousFill means that empty aggregate windows will be filled with whatever the previous aggregate window had
	PreviousFill
)

type GrantAdminStatement added in v0.9.2 

type GrantAdminStatement struct {
	// Who to grant the privilege to.
	User string
}

GrantAdminStatement represents a command for granting admin privilege.

func (*GrantAdminStatement) RequiredPrivileges added in v0.9.2 

func (s *GrantAdminStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a GrantAdminStatement.

func (*GrantAdminStatement) String added in v0.9.2 

func (s *GrantAdminStatement) String() string

String returns a string representation of the grant admin statement.

type GrantStatement 

type GrantStatement struct {
	// The privilege to be granted.
	Privilege Privilege

	// Database to grant the privilege to.
	On string

	// Who to grant the privilege to.
	User string
}

GrantStatement represents a command for granting a privilege.

func (*GrantStatement) RequiredPrivileges 

func (s *GrantStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a GrantStatement.

func (*GrantStatement) String 

func (s *GrantStatement) String() string

String returns a string representation of the grant statement.

type HasDefaultDatabase 

type HasDefaultDatabase interface {
	Node

	DefaultDatabase() string
	// contains filtered or unexported methods
}

HasDefaultDatabase provides an interface to get the default database from a Statement.

type Measurement 

type Measurement struct {
	Database        string
	RetentionPolicy string
	Name            string
	Regex           *RegexLiteral
	IsTarget        bool
}

Measurement represents a single measurement used as a datasource.

func (*Measurement) String 

func (m *Measurement) String() string

String returns a string representation of the measurement.

type Measurements 

type Measurements []*Measurement

Measurements represents a list of measurements.

func (Measurements) String 

func (a Measurements) String() string

String returns a string representation of the measurements.

type Node 

type Node interface {
	String() string
	// contains filtered or unexported methods
}

Node represents a node in the InfluxDB abstract syntax tree.

func Rewrite 

func Rewrite(r Rewriter, node Node) Node

Rewrite recursively invokes the rewriter to replace each node. Nodes are traversed depth-first and rewritten from leaf to root.

func RewriteFunc 

func RewriteFunc(node Node, fn func(Node) Node) Node

RewriteFunc rewrites a node hierarchy.

type NowValuer 

type NowValuer struct {
	Now time.Time
}

nowValuer returns only the value for "now()".

func (*NowValuer) Value 

func (v *NowValuer) Value(key string) (interface{}, bool)

type NumberLiteral 

type NumberLiteral struct {
	Val float64
}

NumberLiteral represents a numeric literal.

func (*NumberLiteral) String 

func (l *NumberLiteral) String() string

String returns a string representation of the literal.

type ParenExpr 

type ParenExpr struct {
	Expr Expr
}

ParenExpr represents a parenthesized expression.

func (*ParenExpr) String 

func (e *ParenExpr) String() string

String returns a string representation of the parenthesized expression.

type ParseError 

type ParseError struct {
	Message  string
	Found    string
	Expected []string
	Pos      Pos
}

ParseError represents an error that occurred during parsing.

func (*ParseError) Error 

func (e *ParseError) Error() string

Error returns the string representation of the error.

type Parser 

type Parser struct {
	// contains filtered or unexported fields
}

Parser represents an InfluxQL parser.

func NewParser 

func NewParser(r io.Reader) *Parser

NewParser returns a new instance of Parser.

func (*Parser) ParseExpr 

func (p *Parser) ParseExpr() (Expr, error)

ParseExpr parses an expression.

func (*Parser) ParseQuery 

func (p *Parser) ParseQuery() (*Query, error)

ParseQuery parses an InfluxQL string and returns a Query AST object.

func (*Parser) ParseStatement 

func (p *Parser) ParseStatement() (Statement, error)

ParseStatement parses an InfluxQL string and returns a Statement AST object.

type Pos 

type Pos struct {
	Line int
	Char int
}

Pos specifies the line and character position of a token. The Char and Line are both zero-based indexes.

type Privilege 

type Privilege int

Privilege is a type of action a user can be granted the right to use. 

const (
	// NoPrivileges means no privileges required / granted / revoked.
	NoPrivileges Privilege = iota
	// ReadPrivilege means read privilege required / granted / revoked.
	ReadPrivilege
	// WritePrivilege means write privilege required / granted / revoked.
	WritePrivilege
	// AllPrivileges means all privileges required / granted / revoked.
	AllPrivileges
)

func NewPrivilege 

func NewPrivilege(p Privilege) *Privilege

NewPrivilege returns an initialized *Privilege.

func (Privilege) String 

func (p Privilege) String() string

String returns a string representation of a Privilege.

type Processor added in v0.9.2 

type Processor func(values []interface{}) interface{}

func GetProcessor added in v0.9.2 

func GetProcessor(expr Expr, startIndex int) (Processor, int)

type Query 

type Query struct {
	Statements Statements
}

Query represents a collection of ordered statements.

func ParseQuery 

func ParseQuery(s string) (*Query, error)

ParseQuery parses a query string and returns its AST representation.

func (*Query) String 

func (q *Query) String() string

String returns a string representation of the query.

type RegexLiteral 

type RegexLiteral struct {
	Val *regexp.Regexp
}

RegexLiteral represents a regular expression.

func CloneRegexLiteral 

func CloneRegexLiteral(r *RegexLiteral) *RegexLiteral

CloneRegexLiteral returns a clone of the RegexLiteral.

func (*RegexLiteral) String 

func (r *RegexLiteral) String() string

String returns a string representation of the literal.

type Result 

type Result struct {
	// StatementID is just the statement's position in the query. It's used
	// to combine statement results if they're being buffered in memory.
	StatementID int `json:"-"`
	Series      models.Rows
	Err         error
}

Rows represents a list of rows that can be sorted consistently by name/tag. Result represents a resultset returned from a single statement.

func (*Result) MarshalJSON 

func (r *Result) MarshalJSON() ([]byte, error)

MarshalJSON encodes the result into JSON.

func (*Result) UnmarshalJSON 

func (r *Result) UnmarshalJSON(b []byte) error

UnmarshalJSON decodes the data into the Result struct

type RevokeAdminStatement added in v0.9.2 

type RevokeAdminStatement struct {
	// Who to revoke admin privilege from.
	User string
}

RevokeAdminStatement represents a command to revoke admin privilege from a user.

func (*RevokeAdminStatement) RequiredPrivileges added in v0.9.2 

func (s *RevokeAdminStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a RevokeAdminStatement.

func (*RevokeAdminStatement) String added in v0.9.2 

func (s *RevokeAdminStatement) String() string

String returns a string representation of the revoke admin statement.

type RevokeStatement 

type RevokeStatement struct {
	// The privilege to be revoked.
	Privilege Privilege

	// Database to revoke the privilege from.
	On string

	// Who to revoke privilege from.
	User string
}

RevokeStatement represents a command to revoke a privilege from a user.

func (*RevokeStatement) RequiredPrivileges 

func (s *RevokeStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a RevokeStatement.

func (*RevokeStatement) String 

func (s *RevokeStatement) String() string

String returns a string representation of the revoke statement.

type Rewriter 

type Rewriter interface {
	Rewrite(Node) Node
}

Rewriter can be called by Rewrite to replace nodes in the AST hierarchy. The Rewrite() function is called once per node.

type Scanner 

type Scanner struct {
	// contains filtered or unexported fields
}

Scanner represents a lexical scanner for InfluxQL.

func NewScanner 

func NewScanner(r io.Reader) *Scanner

NewScanner returns a new instance of Scanner.

func (*Scanner) Scan 

func (s *Scanner) Scan() (tok Token, pos Pos, lit string)

Scan returns the next token and position from the underlying reader. Also returns the literal text read for strings, numbers, and duration tokens since these token types can have different literal representations.

func (*Scanner) ScanRegex 

func (s *Scanner) ScanRegex() (tok Token, pos Pos, lit string)

type SelectStatement 

type SelectStatement struct {
	// Expressions returned from the selection.
	Fields Fields

	// Target (destination) for the result of the select.
	Target *Target

	// Expressions used for grouping the selection.
	Dimensions Dimensions

	// Data sources that fields are extracted from.
	Sources Sources

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned. Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int

	// Maxiumum number of series to be returned. Unlimited if zero.
	SLimit int

	// Returns series starting at an offset from the first one.
	SOffset int

	// if it's a query for raw data values (i.e. not an aggregate)
	IsRawQuery bool

	// What fill option the select statement uses, if any
	Fill FillOption

	// The value to fill empty aggregate buckets with, if any
	FillValue interface{}
	// contains filtered or unexported fields
}

SelectStatement represents a command for extracting data from the database.

func (*SelectStatement) Clone 

func (s *SelectStatement) Clone() *SelectStatement

Clone returns a deep copy of the statement.

func (*SelectStatement) ColumnNames added in v0.9.4 

func (s *SelectStatement) ColumnNames() []string

ColumnNames will walk all fields and functions and return the appropriate field names for the select statement while maintaining order of the field names

func (*SelectStatement) FunctionCalls 

func (s *SelectStatement) FunctionCalls() []*Call

FunctionCalls returns the Call objects from the query

func (*SelectStatement) FunctionCallsByPosition added in v0.9.5 

func (s *SelectStatement) FunctionCallsByPosition() [][]*Call

FunctionCallsByPosition returns the Call objects from the query in the order they appear in the select statement

func (*SelectStatement) GroupByInterval 

func (s *SelectStatement) GroupByInterval() (time.Duration, error)

GroupByIterval extracts the time interval, if specified.

func (*SelectStatement) HasCountDistinct 

func (s *SelectStatement) HasCountDistinct() bool

func (*SelectStatement) HasDerivative 

func (s *SelectStatement) HasDerivative() bool

HasDerivative returns true if one of the function calls in the statement is a derivative aggregate

func (*SelectStatement) HasDimensionWildcard added in v0.9.3 

func (s *SelectStatement) HasDimensionWildcard() bool

HasDimensionWildcard returns whether or not the select statement has at least 1 wildcard in the dimensions aka `GROUP BY`

func (*SelectStatement) HasDistinct 

func (s *SelectStatement) HasDistinct() bool

func (*SelectStatement) HasFieldWildcard added in v0.9.3 

func (s *SelectStatement) HasFieldWildcard() bool

HasFieldWildcard returns whether or not the select statement has at least 1 wildcard in the fields

func (*SelectStatement) HasSimpleCount added in v0.9.6 

func (s *SelectStatement) HasSimpleCount() bool

HasSimpleCount return true if one of the function calls is a count function with a variable ref as the first arg

func (*SelectStatement) HasTimeFieldSpecified added in v0.9.4 

func (s *SelectStatement) HasTimeFieldSpecified() bool

HasTimeFieldSpecified will walk all fields and determine if the user explicitly asked for time This is needed to determine re-write behaviors for functions like TOP and BOTTOM

func (*SelectStatement) HasWildcard 

func (s *SelectStatement) HasWildcard() bool

HasWildcard returns whether or not the select statement has at least 1 wildcard

func (*SelectStatement) IsSimpleDerivative 

func (s *SelectStatement) IsSimpleDerivative() bool

IsSimpleDerivative return true if one of the function call is a derivative function with a variable ref as the first arg

func (*SelectStatement) LimitTagSets added in v0.9.5 

func (s *SelectStatement) LimitTagSets(a []*TagSet) []*TagSet

LimitTagSets returns a tag set list with SLIMIT and SOFFSET applied.

func (*SelectStatement) NamesInDimension added in v0.9.3 

func (s *SelectStatement) NamesInDimension() []string

NamesInDimension returns the field and tag names (idents) in the group by

func (*SelectStatement) NamesInSelect 

func (s *SelectStatement) NamesInSelect() []string

NamesInSelect returns the field and tag names (idents) in the select clause

func (*SelectStatement) NamesInWhere 

func (s *SelectStatement) NamesInWhere() []string

NamesInWhere returns the field and tag names (idents) referenced in the where clause

func (*SelectStatement) RequiredPrivileges 

func (s *SelectStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute the SelectStatement.

func (*SelectStatement) RewriteDistinct 

func (s *SelectStatement) RewriteDistinct()

RewriteDistinct rewrites the expression to be a call for map/reduce to work correctly This method assumes all validation has passed

func (*SelectStatement) RewriteWildcards 

func (s *SelectStatement) RewriteWildcards(fields Fields, dimensions Dimensions) *SelectStatement

RewriteWildcards returns the re-written form of the select statement. Any wildcard query fields are replaced with the supplied fields, and any wildcard GROUP BY fields are replaced with the supplied dimensions.

func (*SelectStatement) SetTimeRange 

func (s *SelectStatement) SetTimeRange(start, end time.Time) error

SetTimeRange sets the start and end time of the select statement to [start, end). i.e. start inclusive, end exclusive. This is used commonly for continuous queries so the start and end are in buckets.

func (*SelectStatement) SourceNames added in v0.9.5 

func (s *SelectStatement) SourceNames() []string

SourceNames returns a list of source names.

func (*SelectStatement) String 

func (s *SelectStatement) String() string

String returns a string representation of the select statement.

func (*SelectStatement) Substatement 

func (s *SelectStatement) Substatement(ref *VarRef) (*SelectStatement, error)

Substatement returns a single-series statement for a given variable reference.

func (*SelectStatement) TimeAscending added in v0.9.5 

func (s *SelectStatement) TimeAscending() bool

TimeAscending returns true if the time field is sorted in chronological order.

type SetPasswordUserStatement 

type SetPasswordUserStatement struct {
	// Plain Password
	Password string

	// Who to grant the privilege to.
	Name string
}

SetPasswordUserStatement represents a command for changing user password.

func (*SetPasswordUserStatement) RequiredPrivileges 

func (s *SetPasswordUserStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a SetPasswordUserStatement.

func (*SetPasswordUserStatement) String 

func (s *SetPasswordUserStatement) String() string

String returns a string representation of the set password statement.

type ShowContinuousQueriesStatement 

type ShowContinuousQueriesStatement struct{}

ShowContinuousQueriesStatement represents a command for listing continuous queries.

func (*ShowContinuousQueriesStatement) RequiredPrivileges 

func (s *ShowContinuousQueriesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowContinuousQueriesStatement.

func (*ShowContinuousQueriesStatement) String 

func (s *ShowContinuousQueriesStatement) String() string

String returns a string representation of the list continuous queries statement.

type ShowDatabasesStatement 

type ShowDatabasesStatement struct{}

ShowDatabasesStatement represents a command for listing all databases in the cluster.

func (*ShowDatabasesStatement) RequiredPrivileges 

func (s *ShowDatabasesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowDatabasesStatement

func (*ShowDatabasesStatement) String 

func (s *ShowDatabasesStatement) String() string

String returns a string representation of the list databases command.

type ShowDiagnosticsStatement 

type ShowDiagnosticsStatement struct {
	// Module
	Module string
}

ShowDiagnosticsStatement represents a command for show node diagnostics.

func (*ShowDiagnosticsStatement) RequiredPrivileges 

func (s *ShowDiagnosticsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowDiagnosticsStatement

func (*ShowDiagnosticsStatement) String 

func (s *ShowDiagnosticsStatement) String() string

String returns a string representation of the ShowDiagnosticsStatement.

type ShowFieldKeysStatement 

type ShowFieldKeysStatement struct {
	// Data sources that fields are extracted from.
	Sources Sources

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowFieldKeysStatement represents a command for listing field keys.

func (*ShowFieldKeysStatement) RequiredPrivileges 

func (s *ShowFieldKeysStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowFieldKeysStatement

func (*ShowFieldKeysStatement) String 

func (s *ShowFieldKeysStatement) String() string

String returns a string representation of the statement.

type ShowGrantsForUserStatement added in v0.9.1 

type ShowGrantsForUserStatement struct {
	// Name of the user to display privileges.
	Name string
}

ShowGrantsForUserStatement represents a command for listing user privileges.

func (*ShowGrantsForUserStatement) RequiredPrivileges added in v0.9.1 

func (s *ShowGrantsForUserStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowGrantsForUserStatement

func (*ShowGrantsForUserStatement) String added in v0.9.1 

func (s *ShowGrantsForUserStatement) String() string

String returns a string representation of the show grants for user.

type ShowMeasurementsStatement 

type ShowMeasurementsStatement struct {
	// Measurement name or regex.
	Source Source

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowMeasurementsStatement represents a command for listing measurements.

func (*ShowMeasurementsStatement) RequiredPrivileges 

func (s *ShowMeasurementsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowMeasurementsStatement

func (*ShowMeasurementsStatement) String 

func (s *ShowMeasurementsStatement) String() string

String returns a string representation of the statement.

type ShowRetentionPoliciesStatement 

type ShowRetentionPoliciesStatement struct {
	// Name of the database to list policies for.
	Database string
}

ShowRetentionPoliciesStatement represents a command for listing retention policies.

func (*ShowRetentionPoliciesStatement) RequiredPrivileges 

func (s *ShowRetentionPoliciesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowRetentionPoliciesStatement

func (*ShowRetentionPoliciesStatement) String 

func (s *ShowRetentionPoliciesStatement) String() string

String returns a string representation of a ShowRetentionPoliciesStatement.

type ShowSeriesStatement 

type ShowSeriesStatement struct {
	// Measurement(s) the series are listed for.
	Sources Sources

	// An expression evaluated on a series name or tag.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowSeriesStatement represents a command for listing series in the database.

func (*ShowSeriesStatement) RequiredPrivileges 

func (s *ShowSeriesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowSeriesStatement.

func (*ShowSeriesStatement) String 

func (s *ShowSeriesStatement) String() string

String returns a string representation of the list series statement.

type ShowServersStatement 

type ShowServersStatement struct{}

ShowServersStatement represents a command for listing all servers.

func (*ShowServersStatement) RequiredPrivileges 

func (s *ShowServersStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowServersStatement

func (*ShowServersStatement) String 

func (s *ShowServersStatement) String() string

String returns a string representation of the show servers command.

type ShowShardGroupsStatement added in v0.9.6 

type ShowShardGroupsStatement struct{}

ShowShardGroupsStatement represents a command for displaying shard groups in the cluster.

func (*ShowShardGroupsStatement) RequiredPrivileges added in v0.9.6 

func (s *ShowShardGroupsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privileges required to execute the statement.

func (*ShowShardGroupsStatement) String added in v0.9.6 

func (s *ShowShardGroupsStatement) String() string

String returns a string representation of the SHOW SHARD GROUPS command.

type ShowShardsStatement added in v0.9.4 

type ShowShardsStatement struct{}

ShowShardsStatement represents a command for displaying shards in the cluster.

func (*ShowShardsStatement) RequiredPrivileges added in v0.9.4 

func (s *ShowShardsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privileges required to execute the statement.

func (*ShowShardsStatement) String added in v0.9.4 

func (s *ShowShardsStatement) String() string

String returns a string representation.

type ShowStatsStatement 

type ShowStatsStatement struct {
	// Module
	Module string
}

ShowStats statement displays statistics for a given module.

func (*ShowStatsStatement) RequiredPrivileges 

func (s *ShowStatsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowStatsStatement

func (*ShowStatsStatement) String 

func (s *ShowStatsStatement) String() string

String returns a string representation of a ShowStatsStatement.

type ShowSubscriptionsStatement added in v0.9.5 

type ShowSubscriptionsStatement struct {
}

ShowSubscriptionsStatement represents a command to show a list of subscriptions.

func (*ShowSubscriptionsStatement) RequiredPrivileges added in v0.9.5 

func (s *ShowSubscriptionsStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege required to execute a ShowSubscriptionStatement

func (*ShowSubscriptionsStatement) String added in v0.9.5 

func (s *ShowSubscriptionsStatement) String() string

String returns a string representation of the ShowSubscriptionStatement.

type ShowTagKeysStatement 

type ShowTagKeysStatement struct {
	// Data sources that fields are extracted from.
	Sources Sources

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of tag keys per measurement. Unlimited if zero.
	Limit int

	// Returns tag keys starting at an offset from the first row.
	Offset int

	// Maxiumum number of series to be returned. Unlimited if zero.
	SLimit int

	// Returns series starting at an offset from the first one.
	SOffset int
}

ShowTagKeysStatement represents a command for listing tag keys.

func (*ShowTagKeysStatement) RequiredPrivileges 

func (s *ShowTagKeysStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowTagKeysStatement

func (*ShowTagKeysStatement) String 

func (s *ShowTagKeysStatement) String() string

String returns a string representation of the statement.

type ShowTagValuesStatement 

type ShowTagValuesStatement struct {
	// Data source that fields are extracted from.
	Sources Sources

	// Tag key(s) to pull values from.
	TagKeys []string

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowTagValuesStatement represents a command for listing tag values.

func (*ShowTagValuesStatement) RequiredPrivileges 

func (s *ShowTagValuesStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowTagValuesStatement

func (*ShowTagValuesStatement) String 

func (s *ShowTagValuesStatement) String() string

String returns a string representation of the statement.

type ShowUsersStatement 

type ShowUsersStatement struct{}

ShowUsersStatement represents a command for listing users.

func (*ShowUsersStatement) RequiredPrivileges 

func (s *ShowUsersStatement) RequiredPrivileges() ExecutionPrivileges

RequiredPrivileges returns the privilege(s) required to execute a ShowUsersStatement

func (*ShowUsersStatement) String 

func (s *ShowUsersStatement) String() string

String returns a string representation of the ShowUsersStatement.

type SortField 

type SortField struct {
	// Name of the field
	Name string

	// Sort order.
	Ascending bool
}

SortField represents a field to sort results by.

func (*SortField) String 

func (field *SortField) String() string

String returns a string representation of a sort field

type SortFields 

type SortFields []*SortField

SortFields represents an ordered list of ORDER BY fields

func (SortFields) String 

func (a SortFields) String() string

String returns a string representation of sort fields

type Source 

type Source interface {
	Node
	// contains filtered or unexported methods
}

Source represents a source of data for a statement.

type Sources 

type Sources []Source

Sources represents a list of sources.

func (Sources) String 

func (a Sources) String() string

String returns a string representation of a Sources array.

type Statement 

type Statement interface {
	Node

	RequiredPrivileges() ExecutionPrivileges
	// contains filtered or unexported methods
}

Statement represents a single command in InfluxQL.

func MustParseStatement 

func MustParseStatement(s string) Statement

MustParseStatement parses a statement string and returns its AST. Panic on error.

func ParseStatement 

func ParseStatement(s string) (Statement, error)

ParseStatement parses a statement string and returns its AST representation.

type Statements 

type Statements []Statement

Statements represents a list of statements.

func (Statements) String 

func (a Statements) String() string

String returns a string representation of the statements.

type StringLiteral 

type StringLiteral struct {
	Val string
}

StringLiteral represents a string literal.

func (*StringLiteral) String 

func (l *StringLiteral) String() string

String returns a string representation of the literal.

type TagSet 

type TagSet struct {
	Tags       map[string]string
	Filters    []Expr
	SeriesKeys []string
	Key        []byte
}

TagSet is a fundamental concept within the query system. It represents a composite series, composed of multiple individual series that share a set of tag attributes.

func (*TagSet) AddFilter 

func (t *TagSet) AddFilter(key string, filter Expr)

AddFilter adds a series-level filter to the Tagset.

type Target 

type Target struct {
	// Measurement to write into.
	Measurement *Measurement
}

Target represents a target (destination) policy, measurement, and DB.

func (*Target) String 

func (t *Target) String() string

String returns a string representation of the Target.

type TimeLiteral 

type TimeLiteral struct {
	Val time.Time
}

TimeLiteral represents a point-in-time literal.

func (*TimeLiteral) String 

func (l *TimeLiteral) String() string

String returns a string representation of the literal.

type Token 

type Token int

Token is a lexical token of the InfluxQL language. 

const (
	// Special tokens
	ILLEGAL Token = iota
	EOF
	WS

	// Literals
	IDENT        // main
	NUMBER       // 12345.67
	DURATION_VAL // 13h
	STRING       // "abc"
	BADSTRING    // "abc
	BADESCAPE    // \q
	TRUE         // true
	FALSE        // false
	REGEX        // Regular expressions
	BADREGEX     // `.*

	// Operators
	ADD // +
	SUB // -
	MUL // *
	DIV // /

	AND // AND
	OR  // OR

	EQ       // =
	NEQ      // !=
	EQREGEX  // =~
	NEQREGEX // !~
	LT       // <
	LTE      // <=
	GT       // >
	GTE      // >=

	LPAREN    // (
	RPAREN    // )
	COMMA     // ,
	COLON     // :
	SEMICOLON // ;
	DOT       // .

	// Keywords
	ALL
	ALTER
	ANY
	AS
	ASC
	BEGIN
	BY
	CREATE
	CONTINUOUS
	DATABASE
	DATABASES
	DEFAULT
	DELETE
	DESC
	DESTINATIONS
	DIAGNOSTICS
	DISTINCT
	DROP
	DURATION
	END
	EXISTS
	EXPLAIN
	FIELD
	FOR
	FORCE
	FROM
	GRANT
	GRANTS
	GROUP
	GROUPS
	IF
	IN
	INF
	INNER
	INSERT
	INTO
	KEY
	KEYS
	LIMIT
	MEASUREMENT
	MEASUREMENTS
	NAME
	NOT
	OFFSET
	ON
	ORDER
	PASSWORD
	POLICY
	POLICIES
	PRIVILEGES
	QUERIES
	QUERY
	READ
	REPLICATION
	RETENTION
	REVOKE
	SELECT
	SERIES
	SERVER
	SERVERS
	SET
	SHOW
	SHARD
	SHARDS
	SLIMIT
	SOFFSET
	STATS
	SUBSCRIPTION
	SUBSCRIPTIONS
	TAG
	TO
	USER
	USERS
	VALUES
	WHERE
	WITH
	WRITE
)

func Lookup 

func Lookup(ident string) Token

Lookup returns the token associated with a given string.

func (Token) Precedence 

func (tok Token) Precedence() int

Precedence returns the operator precedence of the binary operator token.

func (Token) String 

func (tok Token) String() string

String returns the string representation of the token.

type Valuer 

type Valuer interface {
	Value(key string) (interface{}, bool)
}

Valuer is the interface that wraps the Value() method.

Value returns the value and existence flag for a given key.

type VarRef 

type VarRef struct {
	Val string
}

VarRef represents a reference to a variable.

func (*VarRef) String 

func (r *VarRef) String() string

String returns a string representation of the variable reference.

type Visitor 

type Visitor interface {
	Visit(Node) Visitor
}

Visitor can be called by Walk to traverse an AST hierarchy. The Visit() function is called once per node.

type Wildcard 

type Wildcard struct{}

Wildcard represents a wild card expression.

func (*Wildcard) String 

func (e *Wildcard) String() string

String returns a string representation of the wildcard.

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